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<div class="title">dsd_decimator.h</div>  </div>
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<div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="comment">/*</span>
<a name="l00002"></a>00002 <span class="comment"> * dsf2flac - http://code.google.com/p/dsf2flac/</span>
<a name="l00003"></a>00003 <span class="comment"> * </span>
<a name="l00004"></a>00004 <span class="comment"> * A file conversion tool for translating dsf dsd audio files into</span>
<a name="l00005"></a>00005 <span class="comment"> * flac pcm audio files.</span>
<a name="l00006"></a>00006 <span class="comment"> *</span>
<a name="l00007"></a>00007 <span class="comment"> * Copyright (c) 2013 by respective authors.</span>
<a name="l00008"></a>00008 <span class="comment"> *</span>
<a name="l00009"></a>00009 <span class="comment"> * This program is free software; you can redistribute it and/or modify</span>
<a name="l00010"></a>00010 <span class="comment"> * it under the terms of the GNU General Public License as published by</span>
<a name="l00011"></a>00011 <span class="comment"> * the Free Software Foundation; either version 2 of the License, or</span>
<a name="l00012"></a>00012 <span class="comment"> * (at your option) any later version.</span>
<a name="l00013"></a>00013 <span class="comment"> *</span>
<a name="l00014"></a>00014 <span class="comment"> * This program is distributed in the hope that it will be useful,</span>
<a name="l00015"></a>00015 <span class="comment"> * but WITHOUT ANY WARRANTY; without even the implied warranty of</span>
<a name="l00016"></a>00016 <span class="comment"> * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the</span>
<a name="l00017"></a>00017 <span class="comment"> * GNU General Public License for more details.</span>
<a name="l00018"></a>00018 <span class="comment"> *</span>
<a name="l00019"></a>00019 <span class="comment"> * You should have received a copy of the GNU General Public License</span>
<a name="l00020"></a>00020 <span class="comment"> * along with this program; if not, write to the Free Software</span>
<a name="l00021"></a>00021 <span class="comment"> * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA</span>
<a name="l00022"></a>00022 <span class="comment"> *</span>
<a name="l00023"></a>00023 <span class="comment"> * </span>
<a name="l00024"></a>00024 <span class="comment"> * Acknowledgements</span>
<a name="l00025"></a>00025 <span class="comment"> * </span>
<a name="l00026"></a>00026 <span class="comment"> * Many thanks to the following authors and projects whose work has greatly</span>
<a name="l00027"></a>00027 <span class="comment"> * helped the development of this tool.</span>
<a name="l00028"></a>00028 <span class="comment"> * </span>
<a name="l00029"></a>00029 <span class="comment"> * </span>
<a name="l00030"></a>00030 <span class="comment"> * Sebastian Gesemann - dsd2pcm (http://code.google.com/p/dsd2pcm/)</span>
<a name="l00031"></a>00031 <span class="comment"> * SACD Ripper (http://code.google.com/p/sacd-ripper/)</span>
<a name="l00032"></a>00032 <span class="comment"> * Maxim V.Anisiutkin - foo_input_sacd (http://sourceforge.net/projects/sacddecoder/files/)</span>
<a name="l00033"></a>00033 <span class="comment"> * Vladislav Goncharov - foo_input_sacd_hq (http://vladgsound.wordpress.com)</span>
<a name="l00034"></a>00034 <span class="comment"> * Jesus R - www.sonore.us</span>
<a name="l00035"></a>00035 <span class="comment"> * </span>
<a name="l00036"></a>00036 <span class="comment"> */</span>
<a name="l00037"></a>00037  
<a name="l00049"></a>00049 <span class="preprocessor">#define calc_type dsf2flac_float64 // you can change the type used to do the filtering... but there is barely any change in calc speed between float and double</span>
<a name="l00050"></a>00050 <span class="preprocessor"></span>
<a name="l00051"></a>00051 <span class="preprocessor">#ifndef DSDDECIMATOR_H</span>
<a name="l00052"></a>00052 <span class="preprocessor"></span><span class="preprocessor">#define DSDDECIMATOR_H</span>
<a name="l00053"></a>00053 <span class="preprocessor"></span>
<a name="l00054"></a>00054 <span class="preprocessor">#include &lt;dsd_sample_reader.h&gt;</span>
<a name="l00055"></a>00055 
<a name="l00056"></a>00056 <span class="keyword">class </span>dsdDecimator
<a name="l00057"></a>00057 {
<a name="l00058"></a>00058 <span class="keyword">public</span>:
<a name="l00059"></a>00059         dsdDecimator(DsdSampleReader *reader, dsf2flac_uint32 outputSampleRate);
<a name="l00060"></a>00060         <span class="keyword">virtual</span> ~dsdDecimator();
<a name="l00061"></a>00061         <span class="comment">// Method to get the output samples</span>
<a name="l00062"></a>00062         <span class="keyword">template</span> &lt;<span class="keyword">typename</span> sampleType&gt; <span class="keywordtype">void</span> getSamples(sampleType *buffer, dsf2flac_uint32 bufferLen, dsf2flac_float64 scale, dsf2flac_float64 tpdfDitherPeakAmplitude = 0);
<a name="l00063"></a>00063         dsf2flac_uint32 getOutputSampleRate();
<a name="l00064"></a>00064         dsf2flac_int64 getLength(); <span class="comment">// return total length in samples of decimated data</span>
<a name="l00065"></a>00065         dsf2flac_float64 getPosition();
<a name="l00066"></a>00066         dsf2flac_float64 getFirstValidSample();
<a name="l00067"></a>00067         dsf2flac_float64 getLastValidSample();
<a name="l00068"></a>00068         dsf2flac_float64 getPositionInSeconds() { <span class="keywordflow">return</span> getPosition()/outputSampleRate; };
<a name="l00069"></a>00069         dsf2flac_float64 getPositionAsPercent() { <span class="keywordflow">return</span> getPosition()/getLength()*100; };
<a name="l00070"></a>00070         dsf2flac_uint32 getNumChannels() { <span class="keywordflow">return</span> reader-&gt;getNumChannels(); };
<a name="l00071"></a>00071         <span class="keywordtype">bool</span> isValid(); <span class="comment">// return false if the decimator is invalid</span>
<a name="l00072"></a>00072         std::string getErrorMsg(); <span class="comment">// returns a human readable error message</span>
<a name="l00073"></a>00073         <span class="keywordtype">void</span> step() { reader-&gt;step(); }; <span class="comment">// handy wrappers.</span>
<a name="l00074"></a>00074         dsf2flac_uint32 getDecimationRatio() {<span class="keywordflow">return</span> ratio;};
<a name="l00075"></a>00075 <span class="keyword">private</span>:
<a name="l00076"></a>00076         DsdSampleReader *reader;
<a name="l00077"></a>00077         dsf2flac_uint32 outputSampleRate;
<a name="l00078"></a>00078         dsf2flac_uint32 nLookupTable;
<a name="l00079"></a>00079         dsf2flac_uint32 tzero; <span class="comment">// filter t=0 position</span>
<a name="l00080"></a>00080         calc_type** lookupTable;
<a name="l00081"></a>00081         dsf2flac_uint32 ratio; <span class="comment">// inFs/outFs</span>
<a name="l00082"></a>00082         dsf2flac_uint32 nStep;
<a name="l00083"></a>00083         <span class="keywordtype">bool</span> valid;
<a name="l00084"></a>00084         std::string errorMsg;
<a name="l00085"></a>00085         <span class="comment">// private methods</span>
<a name="l00086"></a>00086         <span class="keywordtype">void</span> initLookupTable(<span class="keyword">const</span> dsf2flac_int32 nCoefs,<span class="keyword">const</span> dsf2flac_float64* coefs,<span class="keyword">const</span> dsf2flac_int32 tzero);
<a name="l00087"></a>00087         <span class="keyword">template</span> &lt;<span class="keyword">typename</span> sampleType&gt; <span class="keywordtype">void</span> getSamplesInternal(sampleType *buffer, dsf2flac_uint32 bufferLen, dsf2flac_float64 scale, dsf2flac_float64 tpdfDitherPeakAmplitude, <span class="keywordtype">bool</span> roundToInt);
<a name="l00088"></a>00088         
<a name="l00089"></a>00089 };
<a name="l00090"></a>00090 
<a name="l00091"></a>00091 <span class="preprocessor">#endif // DSDDECIMATOR_H</span>
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